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The Feasibility Analysis of Drip Irrigation Using Three Water Sources in the Hetao Irrigation District

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The Feasibility Analysis of Drip Irrigation Using Three Water Sources in the Hetao Irrigation District nd 2 World Irrigation Forum (WIF2) W.1.4.23 6-8 November 2016, Chiang Mai, Thailand THE FEASIBILITY ANALYSIS OF DRIP IRRIGATION USING THREE WATER SOURCES IN THE HETAO IRRIGATION DISTRICT Jian Yu1, Jinzhong Yang2, Bin Xu3, Wei Li4, Jigang Shi5, Han liu6, Xin Ma7 ABSTRACT Hetao Irrigation District (ID) of Inner Mongolia located in north of China is one of three largest irrigation areas in China, where annual rainfall is ～150 mm. The Yellow River water is a dominant source for agricultural irrigation. With development of industrial and urbanization in the area, there are increasing contradictions between water supply and consuming in the area. A large scale drip irrigation must be developed to improve water use efficiency and to relieve the intensifying contradictions. This paper analyzes feasibility of drip irrigation development using three types of water sources and distribution area of drip irrigation development for every source (i.e. lakes, ground water and Yellow River water); 1) The wide distribution of lakes used as a source of drip irrigation water, which solves sedimentation and water storage problems, has certain development potential in Hetao area; 2) Three canals (Zonggan Canal, Shenwugan Canal and Dongfeng Canal) with shorter water supply cutoff days have the convenient water intake from Yellow River water and there is certain percentage of the wasteland for building sedimentation and water storage pools, the drip irrigation used with Yellow River water could be developed on certain size; 3) The development potential of drip irrigation using ground water is larger compared with other two water sources, but the appropriate proportion ratio between wells and canals irrigation area should be controlled. Based on the balance of exploitation and recharging to ground water, drip irrigation area using ground water may reach 6.67 × 104 hectares in the Hetao Irrigation Area. Keywords: Hetao Irrigation District; lakes; Ground water; Yellow River water; Drip irrigation development potential. 1. INTRODUCTION Hetao Irrigation Area in Inner Mongolia is one of three largest irrigation areas in China with an area of 574 thousand ha, taking ～4.7 billion m3 of water from Yellow River annually. It is important base of grain and vegetable oil production in China. The area is the largest water-user along Yellow River area in Inner Mongolia, accounts for about 75% quota of Inner Mongolia allocated by the state. However, there is a mismatch between water supply and demand due to drought and low rainfall adjacent to Yellow R. With the rapid economic and social development, the area along Yellow River has become an important energy base, with rising urban water demand in recent years. As a result, the competition in water use between industrial and 1 Water Resources Research Institute (WRRI) of Inner Mongolia China. The Hulunbuir south road no. 7, Hohhot, Inner Mongolia, China,010020; E-mail: [email protected] 2 State Key Laboratory of Water Resources and Hydropower Engineering Sciences, Wuhan University, Wuhan China, 430072;E-mail: [email protected] 3 Institute Of Water Resources for Pastoral Area, MWR, Huhhot, China, 010020;E-mail: [email protected] 4 WRRI of Inner Mongolia China. The Hulunbuir south road no. 7, Hohhot, Inner Mongolia, China,010020; 5 WRRI of Inner Mongolia China. The Hulunbuir south road no. 7, Hohhot, Inner Mongolia, China,010020; E-mail:[email protected] 6 Development Research Center of the Ministry of Water Resources of P.R.China. No.7 Yuyuantan South Road, Haidian District, Beijing, China,100038; E-ail:[email protected] 7 WRRI of Inner Mongolia China. The Hulunbuir south road no. 7, Hohhot, Inner Mongolia, China,010020; 1 nd 2 World Irrigation Forum (WIF2) W.1.4.23 6-8 November 2016, Chiang Mai, Thailand agricultural water consumer is intensified. Even with the most stringent water resource management system and the 'double control' actions on total amount of water consumption in the period of 'Thirteen Five', the agriculture in irrigation area consumes the largest proportion of water from the Yellow River, yet faces an enormous challenge. In order to meet water requirements of sustainable development for economy and society, it must increase agricultural water saving and improve agricultural water use efficiency in the area. Drip irrigation is an advanced irrigation technology, provides irrigation and fertilization for crops timely and adequately, and improves water and fertilizer use efficiency. Use of drip irrigation for the crops grown along Yellow River can save irrigation water and achieve better quality and efficiency. However, there are two major problems. First, the high concentration of sand with a large proportion of fine particle in Yellow River water will choke the system. The annual average sediment concentration is 4.5kg m-3 in Zonggan Canal (main canal) in Hetao ID and sediment particle less than 0.005 mm accounts for nearly 50%. According to drip-irrigation water quality standards (Sediment concentration ≤ 50 mg/L), about 99% of sediment has to be removed. The cost of sand filtration is very high, as it involves construction of sedimentation pools, land acquisition for building the pools and dredging sand in the pools every year. The sand in Yellow River water contains organic matter, which is useful for soil enrichment and crop growth, and sand removal will cause a lot of nutrient loss. Secondly, due to varying hierarchy of irrigation canals and a different number of cutoff days in water supply through them (due to rotational water supply), on-demand operation of the drip system cannot be guaranteed. The irrigation canals in Hetao ID have six grades as Zonggan (main canal), Gan (submain canal), Fengan (canal), Zhi (branch canal), Dou (lateral) and Nongqu (sub lateral). Each grade has a certain water supply cutoff days during the crop season. There are about 20 days cutoff per year even for Zonggan (main canal) with longest water delivery period Ganqu’s (submain canals) is generally 25-30 days or more. The longer days water delivery is cutoff are in canals closer to the downstream of the area. Drip irrigation frequency is relatively high, generally about 10 days interval. A larger volume of sedimentation pools is needed in order to ensure the irrigation of crops, entailing a high investment and land expropriation. The feasibility of three water sources for a large scale drip irrigation development is studied. Source I: natural lakes. There are many natural lakes distributing widely in Hetao ID. These lakes are taken as natural sedimentation and water storage pools. The drip irrigation can be developed in the areas surrounding the lakes. Water recharging to the lakes is through canals connected to these lakes during irrigation season or autumn irrigation period. Utilization of lakes as the water source can solve the problem of filtering and water storage. Source II: ground water: This is well-canal irrigation patterns that groundwater is used to develop drip irrigation in current canal irrigation area. A certain area of canal irrigation around well irrigation (drip irrigation) area is required in order to balance between recharging and utilization of ground water. Recharging of groundwater in well irrigation area is through groundwater from canal irrigation area. Utilizing groundwater sources in the area efficiently lowers groundwater table, reduces evaporation as well as salt accumulation in soil. The original canals system in well irrigation area must be retained in order to leach salt through these canals in autumn and spring. Source III: Yellow River water. Along some canals with short water supply cutoff days (within 20 days), wasteland on both sides of these canals can be used to build a certain capacity of pools or reservoirs. 2 nd 2 World Irrigation Forum (WIF2) W.1.4.23 6-8 November 2016, Chiang Mai, Thailand 2. THE DEVELOPMENT POTENTIAL OF DRIP IRRIGATION USING THREE WATER SOURCES 2.1 The natural lakes Hetao ID consists of six counties: Dengkou, Hangjinhouqi, Linhe, Wuyuan, Wulateqianqi and Wulatezhongqi. According to the remote sensing image and field survey, it has been confirmed that there are a total of 447 lakes in the area, in which 369 lakes the area is greater than 6.67 ha (Table 1). Dengkou County located in the upstream of the district has 157 lakes with a area larger than 6.67 hectare, accounting for 35% of all lakes in whole irrigation area (Table 1). Dengkou County is taken as a typical district to interpret the remote sensing images in three periods every early April (before irrigation), end of July (peak period of irrigation) and November (after autumn irrigation). In April, lakes have the largest water surface area while the least one in July. Water surface area is reduced to nearly 25% compared that in April and it returns to the April value in November. Main reasons for the decrease of water surface area in July are small rain, higher summer temperature, larger evaporation and high water consumption for crops and vegetation in the region, leading to declining in groundwater and to reduce the replenishment for the lakes, causing water area to shrink. In November, the weather is cold, evaporation is tapered, and groundwater table rises after autumn irrigation. With water supply to the lakes, water area in the lakes expands. Before irrigation in March and April, by ground water supplying to the lakes in winter, the water surface area is maximized. According to the field survey in Dengkou County, the depth of water is related to water surface area. The depth of water is between 1~1.5 m when water area of the lakes is between 6.67 ~ 66.7 hectares. The depth of water is between 2~3m when water area for the lakes is between 66.7~ 266.7 ha. The depth of the water is about 4 m when the area is larger than 333.3 ha.
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